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^A In the 2.4 GHz bands bonded 40 MHz channels are uniquely named by the primary and secondary 20 MHz channels, e.g. 9+13. In the 5 GHz bands they are denoted by the center of the wider band and the primary 20 MHz channel e.g. 42[40] ^B In the US, 802.11 operation on channels 12 and 13 is allowed under low power conditions.
Using cordless phones that do not use the 2.4 GHz band. Using the 5 GHz band. DECT 6.0 (1.9 GHz), 5.8 GHz or 900 MHz phones, commonly available today, do not use the 2.4 GHz band and thus do not interfere. VoIP/Wi-Fi phones share the Wi-Fi base stations and participate in the Wi-Fi contention protocols.
An example of 2.4 GHz Wi-Fi spectrum: An example of 5 GHz Wi-Fi spectrum: This Netgear Wi-Fi router contains dual bands for transmitting the 802.11 standards across the 2.4 and 5 GHz spectrums and supports MIMO. A dual-band cellular 4G+ Wi-Fi modem by Huawei
It operates in the 2.4 GHz and 5 GHz bands, [9] with an extended version, Wi-Fi 6E, that adds the 6 GHz band. [10] It is an upgrade from Wi-Fi 5 ( 802.11ac ), with improvements for better performance in crowded places.
The main drawbacks of 2.4 GHz vs. these lower-frequency options are: poor signal penetration – 2.4 GHz connections are effectively limited to line of sight or soft obstacles; far less range – GSM or CDMA cell phones can connect reliably at > 16 km (10 mi) distances; the range of GSM, imposed by the parameters of time-division multiple ...
Subsequently in 2016, Wi-Fi Alliance introduced the Wave 2 certification, which includes additional features like MU-MIMO (downlink only), 160 MHz channel width support, support for more 5 GHz channels, and four spatial streams (with four antennas; compared to three in Wave 1 and 802.11n, and eight in IEEE's 802.11ax specification). [17]
Some cordless phones formerly advertised as 5.8 GHz actually transmit from base to phone on 5.8 GHz and transmit from phone to base on 2.4 GHz or 900 MHz, to conserve battery life. The 1.9 GHz band is used by the DECT 6.0 phone standard and is considered more secure than the other shared frequencies.
2.4 – 2.5 GHz 12 12 Yes 61.44 MSPS 2/2 ... 2.4 GHz and 5.8 GHz 40 MHz 12 12 Yes 40 Msps 1/2 Dual Gigabit Ethernet Yes Yes Yes Xilinx Virtex-6 LX240T